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The std::unique algorithm is typically used on a sorted range to produce the list of unique values.

The algorithm will operate on any forward range and will remove consecutive duplicate values.

The copy variant std::unique_copy will emit the unique values through the provided output iterator instead.

Both algorithms provide a C++17 parallel, and C++20 ranges variant.

Compiler Explorer link: https://compiler-explorer.com/z/hxa9MbxnY